Skeletodental measurements in Iraqi patients sample with Class II Division 1 malocclusion and different vertical discrepancies (A comparative cephalometric study)

A. Ali, Fakhri; M. H. Al-Chalabi, Hiba

	Skeletodental measurements in Iraqi patients sample with Class II Division 1 malocclusion and different vertical discrepancies (A comparative cephalometric study)
Journal of baghdad college of dentistry
Article 1, Volume 22, Issue 2, 2010, Pages 87-92
Authors
Fakhri A. Ali; Hiba M. H. Al-Chalabi
Abstract
ABSTRACTBackground: The vertical development in class II malocclusion has an important impact on orthodontic decisionsincluding diagnosis, prognosis and treatment plan, this study is an attempt to explore effective characteristics ofClass II Division 1 malocclusion with increased and decreased vertical measurements by comparing them with ClassII Division 1 malocclusion associated with normal vertical height in Adult Iraqi patients.Materials and method: Lateral cephalometric study was conducted on 75 Class II division 1 patients (diagnosedclinically and radiographically) aged 18-30 years, classified according to skeletal vertical relationship using SN-MPangle into three groups: High angle group (SN-MP>36.5)ْ, low angle group (SN-MP<28)ْ and control group (36.5ْ 28ْ ). Cephalometric analysis of vertical problem was achieved by 13 angular and 9 linear variables usingAutoCAD program 2008.Results: The results revealed that angles: ANB, SNA, SNB, SN-MP, Basal plane, upper and lower occlusal plane andgonial angles and linear measurements: lower anterior, anterior, posterior facial height and the overbite, are all showa significant differences among the three groups, while Saddle angle, upper incisor –palatal plane, lower incisormandibularplane and inter incisal angle as well as the upper anterior, upper posterior facial height, overjet, maxillaryand mandibular base length show a non significant differences among the three groups.Conclusions: In Class II division 1 malocclusion, maxillary and mandibular anterior teeth are proclined regardlessvertical discrepancy and normal overbite is independent of this problem which is mainly arise in the jaws area andthe orthodontic treatment may effectively improve this deformity, also in high angle malocclusion, maxillary growthin downward direction is expected to exceed forward one, which rotate the mandible downward backward,aggravating horizontal and vertical discrepancy of jaws, while In low angle malocclusion, skeletal horizontaldiscrepancy is less than that of the high angle, possibly due to forward upward rotation of the mandible.Key words: Class II, long face, short face. (J Bagh Coll Dentistry 2010;22(2):87-92).

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